/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/MeshRegionOperator.h
Remove the original submesh region and merge in the remeshed version. You can call this multiple times as the base-triangle-set is updated.
false if there were errors in insertion, ie if some triangles failed to insert. Does not revert changes that were successful.
bool BackPropropagate ( bool bAllowSubmeshRepairs )